ContactManager to Grandstream_AddressBook

I use Grandstream telephones and would like to allow them to access the ContactManager telephone book.
I found the following script, which also works, but it gets the contacts from the extensions and not from the ContactManager.

There is a script for Yealink phones that does exactly this.

Could someone kindly help me to rewrite this script into a Grandstream format?

Thanks so much

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